DHT11 vs DHT22 with Arduino | Temperature & Humidity Sensor Tutorial

Hello and welcome to Electro Nerds Academy.
In this lesson, we learn how to interface DHT11 and DHT22 temperature and humidity sensors with Arduino.

In this video, you will learn:

• Differences between DHT11 and DHT22
• Temperature and humidity range, accuracy, and sampling rate
• Internal working of DHT sensors
• How temperature is measured using an NTC thermistor
• How humidity is measured using a capacitive humidity sensor

Communication protocol explained:

• Single-wire digital communication
• Start signal and sensor response
• Data transmission using pulse-width timing
• Why accurate timing is critical when reading DHT sensors

Practical implementation:

• Wiring DHT11 and DHT22 with Arduino
• Pull-up resistor requirement
• Reading temperature and humidity on the Serial Monitor

Arduino libraries used:

• DHT library by Rob Tillaart
• Adafruit DHT library

Code and data handling:

• Reading temperature and humidity values
• Converting temperature from Celsius to Fahrenheit
• Calculating the heat index
• Handling common read errors

This lesson is suitable for students, beginners, and anyone learning Arduino sensors or embedded systems.

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